如何使用php和mysql执行多个AND运算符和OR运算符？

第一个查询工作并显示正确的结果。当我添加一个附加的AND条件时，我得到一个尝试获取非对象错误属性的结果

我可以在一个或另一个条件下成功执行

以下是回应的查询：

SELECT * FROM scores 
WHERE (sortDate <= 20190629 AND sport = football) 
       AND (homeID = 4 OR awayID = 4) 
ORDER BY gameDate DESC

我确信变量正在通过

这个很好用：

$sql = "SELECT * FROM scores 
WHERE sortDate <= $today
AND (homeID = $teamID OR awayID = $teamID)
ORDER BY gameDate DESC";

这一条给出了一个添加的错误，并且：

$sql = "SELECT * FROM scores 
WHERE (sortDate <= $today AND sport = $sportID)
AND (homeID = $teamID OR awayID = $teamID)
ORDER BY gameDate DESC";

试试这个

或

---

运动是一根绳子。您应该这样做：和sport='$sportID'`$sql=SELECT*从排序日期起作用的分数！！非常感谢你。你能告诉我你所说的运动是什么意思吗？第一个是用单引号写的谢谢！。它为什么起作用？其他的都没有单引号。有人说体育是一根绳子这意味着什么？它对你很有用。点击答案。它之所以有效，是因为$sportID是一组字符串，就像足球一样。最好使用预先准备好的语句。引用的所有问题都消失了。

$sql = "SELECT * FROM scores 
WHERE (sortDate <= $today AND sport = '$sportID')
AND (homeID = $teamID OR awayID = $teamID)
ORDER BY gameDate DESC";

$sql = "SELECT * FROM scores 
WHERE (sortDate <= $today) AND (sport = $sportID)
AND (homeID = $teamID OR awayID = $teamID)
ORDER BY gameDate DESC";